Simple download manager for mangareader.net

mangareader.rb

require 'open-uri'
require 'nokogiri'

module Mangareader
  module_function

  BASE_URL = "http://mangareader.net"

  # Example:
  # => Mangareader.download "bleach", 552
  # => Mangareader.download "bleach", 552, test_directory
  #
  # Arguments:
  # => 		name: (String)
  # => chapter: (Integer)
  # => 		 dir: (String)
  def download(name, chapter, dir = [name, chapter].join('_'))
    puts "Runnig..."
    document = open_ [BASE_URL, name, chapter].join(File::SEPARATOR)
    if document
      document.css('#pageMenu option').each do |page|
        current_page = open_ BASE_URL + page['value']
        current_page.css('table div a img').each do |image|
          puts "Saving ---> #{image['src']}"
          save image['src'], dir
        end
      end
    end
    puts "Complete!"
  end

  def open_(url)
    document = nil
    begin
      document = Nokogiri::HTML(open(url))
    rescue Exception => message
      puts message
    end
    document
  end

  def save(src, dir)
    create_destination_folder dir

    File.open(File.join(dir, File.basename(src)), 'wb') do |file|
      file.write(open(src).read)
    end
  end

  def create_destination_folder(dir)
    FileUtils.makedirs dir unless File.exist?(dir)
  end

  private :open_, :save, :create_destination_folder
end